The actual process here isn’t terribly different from a regular Raspberry Pi, which just requires you to hook up the Raspberry Pi Camera Module and then install a bunch of software. The real clever part of this one comes from the ZeroView camera mount, which crams the Pi Zero and camera module into a tiny little case that you can suction cup to a window. West’s camera is set up to send you an email when the camera detects motion, but he does note it might require some experimentation with positioning to limit false positives. Head over to West’s site for the full guide.